高回填地基自支护变径旋挖桩竖向承载性状现场试验研究  

Field test investigation on vertical bearing behavior of self-supporting rotary drilling pile with variable diameters in high backfill foundation

作　　者：刘习前 张瑜 刘启胤 黄平 赵亚强 梁勇 雷强 杨强 丁选明[2] LIU Xi-qian;ZHANG Yu;LIU Qi-yin;HUANG Ping;ZHAO Ya-qiang;LIANG Yong;LEI Qiang;YANG Qiang;DING Xuan-ming(Chongqing Construction Residential Engineering Co.,Ltd.,Chongqing 400015,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆建工住宅建设有限公司,重庆400015 [2]重庆大学土木工程学院,重庆400045

出　　处：《地基处理》2021年第5期376-381,共6页Journal of Ground Improvement

摘　　要：在重庆等西部城市高回填场地较多,选用桩基作为建筑基础形式的案例也越来越多,变径桩作为一种具有承载力高、沉降量小等优点的桩基形式,应用较为广泛。但是目前针对高回填地基中变径旋挖桩的研究相对较少,其承载特性和荷载传递机理等尚未明确。本文针对高回填地基自支护变径旋挖桩竖向承载性状开展了现场试验研究。现场试验位于重庆市巴南区,桩体类型为端承摩擦桩,针对变直径桩,进行了单桩竖向抗压静载试验和桩身内力测试。试验结果表明随着桩长的增加,桩体极限承载力增加明显;在桩体变直径处,桩体内力变化较大。In Chongqing and other western cities in China,high backfill sites spread extensively.At present,pile foundation is commonly selected as building foundation at these sites.As a type of pile foundation with high bearing capacity and small settlement,drilling pile with variable diameters is widely used.However,the research on drilling pile with variable diameters in high backfill foundation is relatively few,and its bearing characteristics together with its load transfer mechanisms are not fully investigated.In this paper,the vertical bearing capacity of self-supporting rotary drilling pile with variable diameters is investigated through field test.The single pile vertical compressive static load test and pile internal force test of an end-bearing friction pile with variable diameters are performed respectively in Banan,Chongqing.The results show that the ultimate bearing capacity of pile increases with an increase of pile length.At the depth where the diameter of the pile changes,the force inside the pile changes as well respectively.

关 键 词：高回填地基 变径桩 现场试验 承载特性 静载试验 

分 类 号：TU74[建筑科学—建筑技术科学]